1.显示超市库存商品信息。

2.显示购物流程提示信息。

3.实现收款过程，反复输入所购各种商品的索引号和购买数量， 　　 　　 直到输入商品索引号“ 1”，结束购物流程。

4.实现收银，根据顾客所交现金，自动找零。

-1. Supermarket display stock information.

         　2. The shopping process message.

         　3. To achieve collection process, repeatedly enter the purchase of various commodities index number and quantity purchased, until the input commodity index number　 1 , the end of the shopping process.

 　4. The realization of the cash register, according to the customer to pay cash, the change automatically.